Only text outline with no background nor foreground text colors indicates motors are in an unarmed state.

Red background and white foreground text colors indicate motors are in an armed state. For some flight controllers the motors are already running in this state.
Blinks rapidly for a short time when state changes.

Callout for current flight mode using three letter abbreviations.
For abbreviations table used for the flight controller you are using see supported [flight controllers] section in the OSD manual.
Blinks rapidly for a short time when mode changes.

Callout for number of waypoints retrieved from the flight controller and that are available for display in the VPI.
Note that the callout is limited to reporting up to 99 waypoints. If more than 99 waypoints are retrieve the callout will still just report W99.

Displayed with green background and white foreground text colors with "W" and two digit number when successfully retrieved the number of waypoints.

Displayed with just black outlining of "NWP" text when no waypoints are available from flight controller.

Displays a graphical ribbon to indicate current compass heading with North, East, South, and West single letter abbreviations at 0, 90, 180, and 270 degrees respectively.
A red arrow is displayed to indicate no home position has been set. Normally seen below North heading.
A blue arrow is displayed to indicate the relative heading as to where the home position is located.

The VPI, or known as the Vehicle Position Indicator, is a graphics overlay that is responsible for displaying the vehicle's current position, the home/takeoff position, distance to home position, and navigation waypoints indicators/icons on top of the artificial horizon.
For the main view screen outline purposes here are details for the following VPI components:

Displays the VPI scale factor and distance between vehicle's position and the home position in units set by the user locale preferences. See [OSDConfig settings manual] for unit configuration details.
First line is the VPI scale factor marked with an X at the end which means the distance from the center of the screen (artificial horizon's cross hairs) to the edge of the screen.
Second line is the distance from the vehicle's position to the home position.

Displays the current vehicle's airspeed (relative to ground by default) in a ribbon style gauge in tens unit increments with a numerical readout on top and in the center of the ribbon.
In addition there is a red arrow that indicates the relative reading provided by the GPS or GPS airspeed specifically. For instance if the red arrow is centered horizontally with the numerical readout then either the GPS agrees with the flight controller's telemetry on current airspeed or there is no GPS airspeed provided then the arrow is simply parked in the middle of the ribbon gauge as is the default state.
Another example is if the red arrow is say 20 units above the center of the ribbon horizontally (or of numerical readout) then the GPS airspeed is 20 units higher than the flight controller's reported airspeed.

The VSI, Vertical Speed Indicator, and also called a Variometer, is a gauge that displays the vehicle's rate of climb in the same units as used for the altitude gauge.
Note: There can only be one type of VSI gauge displayed at one time, however for example display purposes both styles are shown in the screenshot at the top of this page.

Displays the current vehicle's altitude (absolute and relative to ground are supported) in a ribbon style gauge in hundreds unit increments with a numerical readout on top and in the center of the ribbon.
In addition there is a red arrow that indicates the relative reading provided by the GPS or GPS altitude specifically. For instance if the red arrow is centered horizontally with the numerical readout then either the GPS agrees with the flight controller's telemetry on current altitude or there is no GPS altitude provided then the arrow is simply parked in the middle of the ribbon gauge as is the default state.
Another example is if the red arrow is say 150 units below the center of the ribbon horizontally (or of numerical readout) then the flight controller's reported altitude is 150 units higher than the GPS's reported altitude.

Displays the pitch and roll of the vehicle as reported by the flight controller's telemetry data feed.
The artificial horizon is displayed as a series of ladders in ten degree increments with ladders drawn as green being ground, blue ladders sky, and white center ladder as the estimated horizon line position relative to the vehicle's angular orientation.
The ladders slide up and down for pitch and rotate for roll. The artificial horizon has full ±90 pitch and ±180 roll standard degree ranges.
Optionally a crosshair is available to be displayed in the center of the OSD screen as a white box with outward tacks on each side.

Displays the total flight time in <Minutes>:<Seconds>.<Tens of Milliseconds> format.
The flight timer automatically starts upon motor(s) start and stops on motor(s) stop. It however currently does not reset automatically on main power (MBAT) voltage reset (battery swap outs).
To reset the flight timer it requires to either power cycle the OSD board or press the reset button on either the OSD board or OSD Remote board.

Displays the estimated horizontal dilution of precision for the vehicle's GPS location lock. Lower the value the more accurate the GPS coordinates are.
The value is in meters as reported by the GPS receiver.

Meaning to various values:

00.00 — 01.00 is excellent for flying and landing in small yards.

01.00 — 02.00 is excellent for flying and landing in decent sized yards.

02.00 — 05.00 is considered good and reliable.

05.00 — 10.00 is moderate. Still usable, but position will drift a lot.

10.00 — 20.00 is fair, but quite unreliable position lock.

20.00 — 99.99 is completely unusable GPS position.

99.99 typically means no GPS satellites are seen/usable by the GPS receiver.

This is a dual purpose gauge that supports the following operation modes:

Alternative Battery (ABAT)

Displays the voltage value from the ADC(Analog-to-Digital Converter) pin.
Supported range is 0.00 through 30.00 volts.

Analog RSSI (RSSI)

Displays a percentage value 0% from 100% that is translated from minimum and maximum voltage range that is expected from the ADC(Analog-to-Digital Converter) pin.
Supported range is 0.00 through 30.00 volts to provide a 0% to 100% display range.
Example if minimum is set to 7 volts and maximum to 12 volts (5 volt effective range) while the ADC voltage is 10 volts (3 volt effective) then the display value will be 60%.